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The sky is being destroyed by the Carbon dioxide erosion.The umbrella will always reminds us don't forget to care our environment when we're chasing the advanced of technology.It will change its color by pH of acid rain.When pH get lower the color will get darker.Let raindrop drawing on the umbrella and the drops will make the color blooming like watercolr painting.As it return to dry the color will transform to the origional .People who walking on the street in the rainny day will become an art by the umbrella in a city.